Avoid double `pip` output if `--verbose` is used an output includes "Ignoring"
Avoid double `pip` output if `--verbose` is used an output includes "Ignoring"

If the `pip` output already has been printed due to it containing the string
"Ignoring", then avoid printing it again if `--verbose` is enabled.

Ironically, in my simple test of this (`pipenv install --verbose redis`) the
"Ignoring" string is only included in the `pip` output if `--verbose` is
supplied.

kennethreitz/pipenv